This paper is devoted to analysis of the electric loading conditions problem for piezoceramic resonators' forced vibrations. New simple experimental technique together with computing permits us to study many resonators' parameters: admittance, impedance, phase angles, power components, etc. for constant input voltage, constant sample voltage and constant sample current electric conditions based on experimental data for "as it is" regime. Such computer modeling makes it possible to decrease the experimental difficulties and to study in linear approximations the dependence of resonators' parameters on loading conditions. The fundamental modes of vibrations of a thin piezoelectric bar and high cylindrical shell are given as example. It is established that considerable admittance nonlinearity in constant voltage regime and its absence for constant current case are caused by different behavior of instantaneous power level.

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